Which of the following has the longest wavelength?

A. violet

B. ultraviolet radiation

C. red

D. infrared radiation

Infrared radiation

Explanation:

The elecromagnetic spectrum is a group of waves that results from electromagnetic vibrations.

In the spectrum, the frequency of the waves increases as their wavelengths decreases. The spectrum is shown below:

Radio waves Microwaves Infrared Visible light Ultraviolet Xrays